# Identifying sensitive data

Tonic Structural uses its sensitivity scan to identify source data columns that contain sensitive information. The scan ignores truncated tables.

The sensitivity scan identifies Structural's built-in sensitivity types. It also looks for custom types that you define.

You can also manually mark a column as sensitive or not sensitive.

<table data-view="cards"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Run the Structural sensitivity scan</strong></td><td>Run, configure, and get the results of the sensitivity scan.</td><td></td><td><a href="identify-sensitive-data/running-the-structural-sensitivity-scan">running-the-structural-sensitivity-scan</a></td></tr><tr><td><strong>Set column sensitivity manually</strong></td><td>Options to override the results of the sensitivity scan.</td><td></td><td><a href="identify-sensitive-data/sensitivity-set-manually">sensitivity-set-manually</a></td></tr><tr><td><strong>Built-in sensitivity types</strong></td><td>Types of sensitive data that the sensitivity scan can identify.</td><td></td><td><a href="identify-sensitive-data/sensitivity-types-built-in">sensitivity-types-built-in</a></td></tr><tr><td><strong>Configure custom sensitivity rules</strong></td><td>Set up rules to enable the scan to identify other sensitive columns based on the column data types and names.</td><td></td><td><a href="identify-sensitive-data/custom-sensitivity-rules">custom-sensitivity-rules</a></td></tr></tbody></table>